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Nuklearmedizin 2020; 59(03): 228-234
DOI: 10.1055/a-1140-5458
Original Article

Textural features in FDG-PET/CT can predict outcome in melanoma patients to treatment with Vemurafenib and Ipililumab

Daniela Dittrich
1   Klinik und Poliklinik für Nuklearmedizin, Klinikum rechts der Isar der Technischen Universität München, Munich, Germany
,
Thomas Pyka
1   Klinik und Poliklinik für Nuklearmedizin, Klinikum rechts der Isar der Technischen Universität München, Munich, Germany
2   Zentrum für Radiologie und Nuklearmedizin, Klinikum Dritter Orden, Munich, Germany
,
Klemens Scheidhauer
1   Klinik und Poliklinik für Nuklearmedizin, Klinikum rechts der Isar der Technischen Universität München, Munich, Germany
,
Susanne Lütje
3   Klinik und Poliklinik für Nuklearmedizin, Universitätsklinikum Bonn, Bonn, Germany
,
Markus Essler
3   Klinik und Poliklinik für Nuklearmedizin, Universitätsklinikum Bonn, Bonn, Germany
,
Ralph A. Bundschuh
3   Klinik und Poliklinik für Nuklearmedizin, Universitätsklinikum Bonn, Bonn, Germany
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Abstract

Aim Recently, textural parameters assessed in FDG-PET/CT as surrogate marker for tumor heterogeneity have been shown to provide prognostic power. Therefore, we investigated the use of such parameters in FDG-PET/CT examinations before the start of immunotherapy with vemurafenib or ipilimumab in patients with malignant melanoma.

Methods In this retrospective analysis 26 patients with histologically proven advanced melanoma were included. FGD-PET/CT was performed before the start of treatment either with vemurafenib (n = 9) or ipilimumab (n = 17) and tumors were analyzed for textural parameters as well as conventional PET features. Lesions were classified as responding or not responding following PERCIST criteria. ROC analysis was performed to analyze the predictive power and cut-off values. In addition, the change of maximum SUV of the lesions between pretherapeutic PET/CT and another PET/CT performed about 12 weeks after start of treatment was evaluated and correlated with the pretreatment parameters.

Results In both groups, six textural parameters showed statistically significant predictive power as well as the metabolic tumor volume. In the group treated with vemurafenib eight additional textural parameters as well as the maximum and mean SUV and the TLG showed significance. A statistically significant correlation between the change of maximum SUV in the course of treatment and the pretherapeutic parameters was found in both treatment groups for three textural features.

Conclusion In patients with malignant melanoma textural parameters in pretherapeutic FDG-PET/CT examinations seem to have prognostic power for treatment response of immunotherapy with vemurafenib and ipilimumab. This can be an important step towards personalized tumor therapy.

Key words

PET/CT - textural parameters - melanoma - radiomics - therapy response prediction


Publication History

Received: 18 February 2020

Accepted: 16 March 2020

Article published online:
07 April 2020

© Georg Thieme Verlag KG
Stuttgart · New York

 

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